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Because castrol edge 5w30 is so much better for my bmw than Mobil 1? There is also a warning not to add oil additives...so, sans oil additives the difference between the two in a non-tracked car should be negligible. At my first scheduled service I fully expect my bmw dealership (one of the most incompetent I've ever seen) to berate me because I set off their non-castrol oil detectors.
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